Unknown ENDENT

Getting the following error. Not sure why. ImageMagick doesn't complain that it can't find the image. Using local storage, not S3.

```
events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: spawn ENOENT
    at errnoException (child_process.js:1001:11)
    at Process.ChildProcess._handle.onexit (child_process.js:792:34)
```
